Aotearocumella watlingi, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 13-19

Aotearocumella watlingi n. sp.

Figures 6–9

Type material. Holotype ovigerous female, NIWA 80723 ; paratype ovigerous female, dissected, NIWA 80724 ; paratype adult male, dissected, NIWA 80725 ; 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007.

Other material examined. 8 ovigerous females, 3 juveniles, NIWA 79384 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 ; 39 ovigerous females, 1 subadult female, NIWA 46010 , 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007 . 1 ovigerous female, NIWA 79385 , 40.1277°S, 170.2140°E – 40.1352°S, 170.2090°E, 803–805 m, 5 June 2007 .

Diagnosis. Female and subadult males. Carapace, pereon and pleon with long setae, without spines. Male. Antenna short, clasping form.

Description of female.

Holotype ovigerous female, 2.8 mm, NIWA 80723 . Paratype ovigerous female, 2.3 mm, NIWA 80724 . Carapace, pereonites and pleonites with many long setae, pseudorostral lobes 0.4 times carapace length; eyelobe present, without lenses; carapace 1.5 times length of pereonites together ( Figure 6A–B) .

Antennule peduncle article 1 longest, with single spine and simple seta; article 2 0.8 times length of article 1, with 2 pedunculate setae; article 3 0.8 times length of article 2, with simple seta; main flagellum of 3 articles, with 3 aesthetascs and 4 simple setae; accessory flagellum of 2 articles, 0.6 times length of first article of main flagellum, with simple seta terminally ( Figure 6C).

Maxillule with 2 endites; outer endite with double row of stout simple setae; inner endite with 5 setae; palp with 2 setae terminally ( Figure 6D).

Maxilla with 3 endites; broad endite with 3 pappose and several simple setae terminally, medial row of pedunculate setae; medial narrow endite with 3 simple setae terminally; distal narrow endite with 4 simple setae terminally; both narrow endites not extending past distal margin of broad endite ( Figures 6E, F).

Maxilliped 1 basis as long as next three articles together, with simple and hook setae; ischium absent; merus unarmed; carpus twice merus length, with medial row of simple and comb-like setae; propodus 0.7 times carpus length, with 1 pappose and 3 simple setae; dactylus 0.9 times propodus length, with simple setae terminally, terminal seta very short ( Figure 6G).

Maxilliped 2 basis 0.8 times length of all other articles together, with 1 pappose seta medially; ischium 0.04 times basis length, unarmed; merus 8.0 times ischium length, with medial pappose seta, lateral margin lined with fine hairlike setae; carpus 1.5 times merus length, with 2 pappose setae medially; propodus 0.8 times carpus length, with 2 plumose and 2 simple setae; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 6H).

Pereopod 1 basis 0.8 times length of all other articles together, with 7 simple setae; ischium 0.1 times basis length, unarmed; merus 1.6 times ischium length, with simple seta; carpus 2.3 times merus length, with 2 simple setae; propodus equal to carpus length, with 2 simple setae; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 7A).

Pereopod 2 basis equal to all other articles together, with 6 simple setae; ischium absent; merus 0.06 times basis length, with simple seta; carpus 7.7 times merus length, with 3 simple setae and 1 microserrate seta distally; propodus 0.3 times carpus length, with simple seta; dactylus 1.9 times propodus length, with 7 simple setae and 1 terminal seta ( Figure 7B).

Pereopod 3 basis 1.3 times all other articles together, with 5 simple setae; ischium 0.1 times basis length, with simple seta; merus 1.3 times ischium length, unarmed; carpus 1.8 times merus length, with 2 simple and 1 annulate setae; propodus 0.1 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 1 seta terminally ( Figure 7C).

Pereopod 4 basis with simple setae, broken; ischium with simple seta; merus 1.2 times ischium length, with simple seta; carpus 3.2 times merus length, with annulate seta; propodus 0.3 times carpus length, with annulate seta; dactylus 0.7 times propodus length, with 1 seta terminally ( Figure 7D).

Pereopod 5 basis 0.7 times all other articles together, with 3 simple setae; ischium 0.2 times basis length, with simple seta; merus 1.6 times ischium length, with simple seta; carpus 2.1 times merus length, with 1 simple and 1 annulate setae; propodus 0.4 times carpus length, with 1 simple and 1 annulate setae; dactylus 0.3 times propodus length, with 1 seta terminally ( Figure 7E).

Uropod peduncles 0.7–0.8 times pleonite 6 length, with 1 stout and 3–4 slender simple setae. Uropod endopod uniarticulate, 0.9–1.0 times peduncle length, medial margin serrate, with 4 simple setae, lateral margin with 1–3 simple and 1 complex pedunculate setae, terminal seta with single subterminal setule. Uropod exopod of 2 articles, 0.8–0.9 length of endopod; article 1 with simple seta; article 2 with 2 simple setae, terminal seta long, broken ( Figure 7F).

Description of male.

Paratype adult male, 2.6 mm, NIWA 80725 . Carapace, pleonites and pereonites with long setae; pseudorostral lobes 0.4 times carapace length; eyelobe present, without lenses; carapace twice length of pereonites together ( Figure 8A) .

Antennule peduncle article 1 with simple seta; article 2 1.1 times length of article 1, with 2 simple setae; article 3 0.8 times length of article 2, lateral margin lined with aesthetascs, group of short simple setae terminally; main flagellum of 2 articles, with 4–5 aesthetascs, terminal seta plumose; accessory flagellum of 2 articles, with 2–3 aesthetascs ( Figure 8B).

Antenna short, clasping form, not extending to posterior border of carapace; peduncle of 5 articles; articles 2–3 with 1 pappose seta each; article 4 with simple seta; article 5 with ranks of setae distally, incompletely circling article; flagellum shorter than peduncle, with 7 articles, each with 1–2 short setae ( Figure 8C).

Maxilliped 3 basis 1.2 times all other articles together, with 2 plumose setae distally, pappose seta medially; ischium 0.06 times basis length, unarmed; merus 3.3 times ischium length, with plumose seta distally and pappose seta medially; carpus 0.9 times merus length, with plumose seta distally, pappose seta medially; propodus 1.6 times carpus length, with 2 pappose setae medially; dactylus 0.5 times propodus length, with 3 simple setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 8D).

Pereopod 1 basis 0.8 times length of all other articles together, with 2 plumose setae; ischium 0.1 times basis length, with simple seta; merus 1.3 times ischium length, with plumose seta; carpus 3.6 times merus length, with 3 simple setae; propodus 0.6 times carpus length, with 2 simple setae; dactylus 0.7 times propodus length, with 5 simple setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 8E).

Pereopod 2 basis 0.8 times length of all other articles together, margin with teeth, with 2 plumose setae; ischium 0.06 basis length, with plumose seta; merus 3.3 times ischium length, with 2 simple and 1 plumose setae; carpus 1.6 times merus length, with 2 plumose and 1 simple setae, distal corner with 2 microserrate setae; propodus 0.5 times carpus length, with simple seta; dactylus 2.8 times propodus length, with 5 simple setae and 1 microserrate and 1 simple setae terminally; exopod 1.2 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 9A).

Pereopod 3 basis 1.2 times length of all other articles together, with 5 plumose and 1 pedunculate setae; ischium 0.3 times basis length, with 2 simple setae; merus 2.0 times ischium length, with 2 simple setae; carpus 1.5 times merus length, with 1 simple and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus equal to propodus length, with 1 seta terminally ( Figure 9B).

Pereopod 4 basis 0.6 times length of all other articles together, with 1 plumose and 1 simple setae; ischium 0.4 times basis length, with simple seta; merus equal to ischium length, with 2 simple setae; carpus 1.2 times merus length, with 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.9 times propodus length, with 1 seta terminally ( Figure 9C).

Pereopod 5 basis 0.7 times length of all other articles together, with 3 plumose setae; ischium 0.3 times basis length, with 1 plumose and 1 simple setae; merus 0.8 times ischium length, with plumose seta; carpus 1.7 times merus length, with annulate seta; propodus 0.4 times carpus length, with annulate seta; dactylus equal to propodus length, with 1 seta terminally ( Figure 9D).

Uropod peduncles 2.1–2.2 times pleonite 6 length, lateral margins with strong teeth, with 5–6 slender simple setae medially. Uropod endopod uniarticulate, 0.8 times peduncle length, medial margin with teeth increasing in size distally, with 7 microserrate setae medially, pedunculate setae laterally, microserrate seta and simple seta terminally. Uropod exopod 0.9 times length of endopod; article 1 0.2 times length of article 2, with simple seta; article 2 with 4 simple setae and 2 simple setae terminally ( Figure 9E).

Etymology. The new species is named watlingi in honor of Les Watling.

Remarks. Aotearocumella watlingi is similar to the other species of Aotearocumella and Styloptocuma from New Zealand waters, S. gordoni , A. acantha and A. echinoseta , in overall body form. Aotearocumella echinoseta is the most similar, in that there are long setae all over the body; however, A. echinoseta has a single large spine dorsally on the carapace and spines on the ventral margin of the carapace, which are both lacking in A. watlingi . Aotearocumella acantha is covered in small spines and has no long setae on the body or carapace, unlike A. watlingi . Styloptocuma gordoni has exopods to pereopod 2 in the female and pereopod 4 in the male, and there are many spines dorsally on the carapace, unlike A. watlingi which has no exopods in the female and exopods only to pereopod 2 in the male, and lacks any dorsal spination of the carapace.

Atlantocuma B ă cescu & Muradian 1974

Type species. Atlantocuma benguelae Băcescu & Muradian 1974

Diagnosis after Akiyama 2012. Females and subadult males. Carapace smooth, without ridges or carinae; pseudorostrum pointed. Pleon slender. Antennule main flagellum of 3 articles; accessory flagellum uniarticulate. Mandibles navicular. Fully developed exopods present on maxilliped 3-pereopod 1. Uropod peduncles much longer than rami; endopod uniarticulate. Ovigerous females may have a less arched carapace and degenerate mouthparts, decalcified and with few setae. Male. Pseudorostrum truncate or weakly pointed. Antennule main flagellum of 4 articles. Antenna short, flagellum of about 10 articles, not clasping form. Exopods present on maxilliped 3-pereopod 4.

New Zealand species. Atlantocuma confunda n. sp.

Remarks. Atlantocuma has been placed variously in the Bodotriidae and Nannastacidae ( Akiyama 2012 and references therein). Haye’s (2007) morphological phylogenetic analysis supported placement of Atlantocuma outside of the Bodotriidae , and in agreement with this phylogenetic study, I place Atlantocuma in the Nannastacidae . Within the New Zealand nannastacid fauna, this genus is readily distinguishable by the presence of exopods only on maxilliped 3-pereopod 1 in the female. The most likely confusion with this species is the familial placement, as superficially it resembles the members of the Bodotriinae, a subfamily of the Bodotriidae , in that the females have no exopods past pereopod 1. As the only genus of Bodotriinae currently known from New Zealand is Cyclaspis , confusion of female Atlantocuma with female Cyclaspis is likely. Females of the two genera can be differentiated by pseudorostrum: eyelobe proportions and the shape of maxilliped 3. In New Zealand Cyclaspis , the pseudorostral lobes meet at the anterior tip of the eyelobe, or do not meet, and the eyelobe in several species posseses lenses. Also, in Cyclaspis the basis of maxilliped 3 has a large distal expansion extending at least to the midpoint of the merus. In comparison, in Atlantocuma the pseudorostral lobes meet and extend well past the eyelobe, which is very small and without lenses; also, the basis of maxilliped 3 has no expansion.